Refactor, update to Pydantic v2 (#65)

Previously confection did three tree operations simultaneously (in the registry._fill method):

* Build a version of the config with defaults in-place
* Build a modified version suitable for validation
* Build an output version with promises resolved

The fact that all three were being built at once made the code quite hard to update for Pydantic 2, and just difficult to work with in general. I've therefore refactored the code so that these are separate processes that apply to the whole tree at once.

A bonus of this is that we now build a model for the whole config and validate against that, which means all the validation errors for the config should come in at once, instead of only getting validation errors for one promise at a time.

Updating to Pydantic v2 will let spaCy finally support Python 3.13.

Author: honnibal

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Configure Python version
         uses: actions/setup-python@v5
         with:
-          python-version: "3.7"
+          python-version: "3.10"
 
       - name: black
         run: |
@@ -39,20 +39,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python_version: [ "3.12" ]
-        include:
-          - os: windows-2019
-            python_version: "3.6"
-          - os: ubuntu-latest
-            python_version: "3.7"
-          - os: windows-latest
-            python_version: "3.8"
-          - os: macos-latest
-            python_version: "3.9"
-          - os: ubuntu-latest
-            python_version: "3.10"
-          - os: windows-latest
-            python_version: "3.11"
+        python_version: ["3.10", "3.12", "3.13"]
 
     runs-on: ${{ matrix.os }}
 
@@ -71,17 +58,6 @@ jobs:
           python -m pip install -U -r requirements.txt
           python -m build --sdist
 
-      - name: Run mypy for Pydantic v2
-        run: |
-          python -m mypy confection
-        if: matrix.python_version != '3.6' && matrix.python_version != '3.7'
-
-      - name: Run mypy for Pydantic v1.10
-        run: |
-          python -m pip install -U pydantic==1.10.*
-          python -m mypy confection
-        if: matrix.python_version != '3.6' && matrix.python_version != '3.7'
-
       - name: Delete source directory
         run: rm -rf confection
         shell: bash
@@ -100,16 +76,6 @@ jobs:
       - name: Test import
         run: python -c "import confection" -Werror
 
-      - name: Install test requirements with Pydantic v1
-        run: |
-          python -m pip install -U -r requirements.txt
-          python -m pip install -U "pydantic<2.0"
-
-      - name: Run tests for Pydantic v1
-        run: |
-          python -c "import pydantic; print(pydantic.VERSION)"
-          python -m pytest --pyargs confection -Werror
-
       - name: Install test requirements with Pydantic v2
         run: |
           python -m pip install -U -r requirements.txt